https://bugs.freedesktop.org/show_bug.cgi?id=104214
--- Comment #40 from Andriy Khulap <andriy.khu...@globallogic.com> ---
I was able to reproduce the Bug 104301 on the following system:
Intel(R) HD Graphics 530 (Skylake GT2) (0x191b)
Ubuntu 16.04 LTS (Kernel 4.4.0)
Mesa 17.3.0 and latest from git.
mpv 0.14.0-git-e1993d5
Debugging showed the following sequence:
1. dri3_get_buffer() is called with draw->num_back=3 and so dri3_find_back()
returns buf_id=2.
2. then dri3_fence_await() is called and starts to process events:
XCB_PRESENT_COMPLETE_NOTIFY which dri3_update_num_back() to num_back=2;
XCB_PRESENT_EVENT_IDLE_NOTIFY which free currently used buffer with id=2.
3. buffer becomes corrupted (e.g. buffer->image->bo=0x55), dri3_get_buffer()
continues to use that buffer and then tries to dri3_free_render_buffer().
buffer->image->bo is not NULL so passes the check in brw_bo_unreference() and
causes segmentation fault.
Patch from Comment 29 solved that issue for me, I can't reproduce it any more.
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